Flexible swivel coupling for underground sprinkler systems

Pipe joints or couplings – Elbow – Serially connected – adjustable

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Details

285423, 285 5, 285235, 285397, A01G 2500, F16L 5500

Patent

active

059215909

ABSTRACT:
A flexible swivel coupling includes a a first elbow, a second elbow, and a flexible nipple connected between the two elbows. The first and second elbows are threaded on the interior surface of at least one of the legs of each elbow, and the flexible nipple is threaded at both ends, for connection between the two elbows. The outside diameter of the nipple, at least at the threaded ends, is slightly larger than the inside diameter of the threaded legs of the two elbows, so that the nipple threads are slightly compressed when the nipple is threaded into the elbows and forms a water tight seal without the need for o-rings or other additional sealing means.

REFERENCES:
patent: 3315986 (1967-04-01), Quick
patent: 3360283 (1967-12-01), Guthrie
patent: 3540223 (1970-11-01), Ebbe
patent: 3759445 (1973-09-01), King
patent: 4314717 (1982-02-01), Bjurman
patent: 4537428 (1985-08-01), Landriault
patent: 4810008 (1989-03-01), Brodie
patent: 5040729 (1991-08-01), Carrozza
patent: 5078430 (1992-01-01), St. Onge
patent: 5150838 (1992-09-01), Roberts
patent: 5242112 (1993-09-01), Dunn et al.
patent: 5383692 (1995-01-01), Watts

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